<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    /* 应用于所有元素 */
    * {
        color: red;
    }
</style>
<body>
    <div>我的</div>
    <span>我的</span>
    <ul>
        <li>我的</li>
    </ul>
</body>
</html>